大表百万条以上记录非主键索引删除大量数据的操作方法

1.SHOW CREATE TABLE ooo_scrm_customer;

2.创建同ooo_scrm_customer表结构一样的新表：_ooo_scrm_customer_new 

REATE TABLE _ooo_scrm_customer_new (

`id` int(11) NOT NULL AUTO_INCREMENT,

    .....

    .....

    .....

PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

3.创建增删改触发器（主要用于主表向中间表写数据时，业务方请求修改的数据要一起同步到中间表）

CREATE TRIGGER `ooo_scrm_customer_del` AFTER DELETE ON ooo_scrm_customer FOR EACH ROW DELETE IGNORE FROM _ooo_scrm_customer_new WHERE _ooo_scrm_customer_new.`id` <=> OLD.`id`

CREATE TRIGGER `ooo_scrm_customer_upd` AFTER UPDATE ON ooo_scrm_customer FOR EACH ROW REPLACE INTO _ooo_scrm_customer_new(`id`, `其他列`) VALUES (NEW.`id`, NEW.`其他列`)

CREATE TRIGGER `ooo_scrm_customer_ins` AFTER INSERT ON ooo_scrm_customer FOR EACH ROW REPLACE INTO _ooo_scrm_customer_new(`id`, `其他列`) VALUES (NEW.`id`, NEW.`其他列`)

4.将要保留的数据写入中间表

INSERT LOW_PRIORITY IGNORE INTO _ooo_scrm_customer_new (`id`, `其他列`) SELECT `id`, `其他列` FROM ooo_scrm_customer LOCK IN SHARE MODE #where 条件优化，按分批执行思想，稳步执行！

5.优化中间表

ANALYZE TABLE_ooo_scrm_customer_new 

6.改名并删除操作记录

RENAME TABLE ooo_scrm_customer TO _ooo_scrm_customer_old, _ooo_scrm_customer_new TO ooo_scrm_customer

DROP TRIGGER IF EXISTS `mysqlcheck`.`ooo_scrm_customer_del`

DROP TRIGGER IF EXISTS `mysqlcheck`.`ooo_scrm_customer_upd`

DROP TRIGGER IF EXISTS `mysqlcheck`.`ooo_scrm_customer_ins`